If you been cruising the Playstore for music applications there is a big chance that you encountered this app. It is one of the older ones and being a stable and good Drum machine/sampler sequencer that can be a good thing to have if you just want to fire up an app for some beat making without having to delve into complexities.Now it comes with midi functions for you that have the possibilities to use an OTG-USB cable. Playstore link:Electrum Drum Machine / Sampler